Zirconia Materials

ZYF Zirconia Felt, ZYF is a flexible high temperature insulation that can be used as a separator, wrapper, fixture, gasket, cushion, pillow, pad, barrier, cover, layering, or packing material in high temperature applications. Some specific applications for ZYF are in the Czochralski method of crystal growing, as iridium and platinum crucible insulation, precious metal condensate reclamation material, and glass fiber manufacturing.

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Powder Loaded ZYF properties are modified by filling the open porosity with various inorganic powders. Any of our ZYF products can be custom-treated to your specifications.

ZYF-A2.13 is filled with alumina powder and high-fired to a rigid board. ZYF-S.75G is filled with 0.75g of silica powder per 1g of ZYF, remaining pliable. ZYF-Z1.5G is filled with 1.5g of zirconia powder per 1g of ZYF and dyed green for identification. 

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ZYF-100A Low Sodium Zirconia Felt is processed to have a lower sodium content than ZYF-100. It is the best choice for sodium-intolerant glass manufacturing. 

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ZYW Zirconia Woven Cloth is a flexible textile composed of yttria-stabilized zirconia fibers that offer extreme temperature and chemical resistance in a flexible form. ZYW cloths provide the lowest thermal conductivity of any commercially available refractory material in their class. They are constructed of continuous individual filaments mechanically interlocked in a woven structure.

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Three different powdered samples labeled ZYBF-1, ZYBF-2, and ZYBF-5, displayed against a blue background, illustrating varying textures and colors for comparison.

ZYBF Zirconia Bulk Fibers are available in three different forms, all having useful properties up to 2200°C. These polycrystalline fibers can be vacuum formed into rigid shapes, placed into cavities as loose fill insulation, or added to ceramic bodies and coatings for reinforcement. They are differentiated by fiber length, surface area, crystalline size, and porosity. However, they all share the same fiber diameter and calcined chemical composition.

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ZYFB and FBD Zirconia Boards and Cylinders ZYFB-3, ZYFB-6, and FBD are rigid refractory structures composed of our own ZYBF Bulk Fibers, which are openly porous. These materials are nearly 100% zirconia phase stabilized with yttria (YSZ). They have extremely low thermal conductivity, are rated for use up to 2000°C, and can be exposed to higher temperatures, up to 2200°C, depending on the application.

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ZYZ Zirconia Boards are rigid, refractory structures composed of yttria-stabilized zirconia (YSZ) fibers, bonded with silica. This composition provides ZYZ insulation with the low thermal conductivity of zirconia fibers combined with the strength and machinability of a silica-bonded material. ZYZ is evenly bonded, allowing it to be machined to tight tolerances and intricate shapes. ZYZ has a lower coefficient of thermal expansion than our ZYFB materials.

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ZYC Zirconia Cylinders are firm, rigid, free-standing refractory structures composed of yttria-stabilized zirconia fibers evenly bonded with amorphous silica, allowing intricate shapes to be machined to tight tolerances. ZYC is manufactured with our own unique ZYBF Bulk Fibers. ZYC cylinders possess low thermal conductivity and good resistance to thermal shock. ZYC is manufactured using a proprietary vacuum forming technique, which includes pre-treatment of the ZYBF fiber prior to establishment of the silica bond. The formed product is further processed in a controlled environment, then fired, resulting in a ceramic with insulating properties that excel at extremely high temperatures.

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DZSP Zirconia Setter Plates and Trays are hard, rigid, dry-pressed, and high-fired structures. DZSP zirconia setter plates are excellent kiln furniture for firing PZT piezoelectric parts and other electro-ceramics, such as barium titanate (BaTiO3) capacitors. DZSP is dimensionally stable to 1650°C. They are composed of zirconia, partially stabilized with calcia, which is chemically inert and has good thermal shock resistance. It has exceptional resistance to oxidizing and reducing atmospheres at high temperatures. DZSP resists most corrosive environments, contains no organic binders, produces no smoke, and will not outgas.

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ZR-CEM Zirconia Cement is an off-white single-part yttria-stabilized zirconia adhesive with a useful temperature limit of 2200°C. ZR-CEM is formulated specifically for bonding our ZrO₂ fibrous ceramic felts, boards, and cylinders to themselves or to porous back-up thermal insulations such as porous firebrick, alumina, and alumino-silicate fiber boards.

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ZR-RIG Zirconia Rigidizer is formulated for the surface hardening of all zirconia fiber products and for use in the fabrication of zirconia composites from textiles and other advanced materials. Such composites are comprised of a matrix of zirconia fibers reinforced with sub-micron zirconia particles. ZR-RIG has the same calcined composition as our ZYBF zirconia fibers and forms a fully stabilized zirconia body upon curing.

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ZYP Zirconia Powder is an ultrafine powder that is used as filtration media, thermal barrier coating, and a polishing aid. These materials are fine, highly reactive powders composed of nearly 100% zirconia phase stabilized with yttria. It is offered with three different surface areas; Sintering of ZYP powder particles begins at around 900°C, and zirconia ceramic bodies approaching theoretical density can be achieved using ZYP as low as 1450°C.

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What Makes Our Zirconia Unique

The Zircar Process produces fibers that are unique due to the open and closed porosity. This is a one-of-a-kind porosity and is exclusive to Zircar. These products are the best-performing ZrO2 fibrous ceramics in the industry, outperforming all others when challenged with extreme temperatures and severe environments.

The micrographs below show the very porous nature and lengths of the individual fibers used in different product types. The micrographs also illustrate the serrated structure, which is characteristic of all of our Zircar zirconia fibers. The fibers of the rigid materials are preferentially arranged parallel to the vacuum-formed board face, creating anisotropic behavior.

Vacuum-formed ceramic fiber boards exhibit lower compressive strength and thermal conductivity perpendicular to the fiber plane, while shrinkage is greater. Boards have the fiber plane parallel to their faces, while cylinders have their fibers aligned perpendicular to the radius of the cylinder. Custom cylinders and boards can be manufactured with fiber orientation as required for your application.

The micrographs on the bottom show the highly sintered exterior and porous interior structure of the individual fibers. Note that because FBD is processed at a very high temperature, the individual fiber grains grow to be almost as large as the fiber diameter and meld into a very smooth, highly sintered microstructure.

Micrographs displaying detailed structures of materials ZYFB-3, ZYF, and FBD, showcasing various magnifications and textures for analysis and comparison.

Thermal Conductivity of Zircar Zirconia Fibers

At very high temperatures in vacuum and inert or reducing atmospheres, zirconia loses a small amount of oxygen. The reaction results in a color change from white to gray, but most other properties remain essentially unchanged, and insulation effectiveness is not impaired.

1 to 2% hafnium oxide (HfO2) occurs naturally with zirconium oxide. Zirconia has the lowest thermal conductivity of any commercial refractory and is one of the most studied ceramic materials in the world.

Upon heating, unstabilized zirconia undergoes disruptive phase changes. At room temperature, unstabilized ZrO2 adopts a monoclinic crystal structure and transitions to tetragonal and cubic at higher temperatures. The volume expansion caused by the cubic to tetragonal to monoclinic transformation induces large stresses, which cause cracking on cooling. The addition of yttria eliminates the phase transitions by stabilizing the tetragonal and cubic phases. Zircar ZrO2 is phase stabilized with 10 wt%Y2O3.

Graph illustrating the thermal conductivity of ZIRCAR ZrO₂ fibrous ceramic insulation across temperatures, comparing various samples' performance.

Quality Policy

Zircar Zirconia, Inc. is committed to delivering goods and services that meet or exceed customer expectations, on time, to generate a profit. We comply with regulatory, statutory, and ISO 9001:2015 requirements. We promote a safe and positive working environment for our employees.

If you are interested in any of our products and would like more information, please contact us.